Middle Ordovician conodonts from the Buchans Group, central Newfoundland, and their significance for regional stratigraphy of the Central Volcanic Belt: Discussion
Middle Ordovician conodonts from the Buchans Group, central Newfoundland, and their significance for regional stratigraphy of the Central Volcanic Belt: Discussion
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纽芬兰中部巴肯斯群的中奥陶世牙形石及其对中央火山带区域地层学的意义：讨论
DOI：
10.1139/e85-048
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
W. Kidd
中科院分区：
文献类型：
--
作者：
T. Kusky;W. Kidd
Nowlan和Thurlow最近报道了在纽芬兰中部的Buchans群中发现的最新Arenig早期Llanvirn时代的牙形石动物群，并认为这表明加拿大阿巴拉契亚山脉的所有火山成因块状硫化物矿床以及相关的火山作用都属于Caradocian或更早的奥陶纪时期。他们接着说，这需要对阿巴拉契亚北部的构造模型进行实质性的修订。我们欢迎这一重要的贡献，有助于了解罗伯茨火山带的年龄（包括布坎斯群；Dean 1977），但发现他们认为纽芬兰中部目前的构造模型是不充分的或错误的，在某种程度上具有误导性。如果他们所指的“构造”模型是Dean（1977,1978）、Strong（1977）或Dean and Kean（1980）的模型，情况可能就是如此。然而，他们的结果有力地支持Kidd等人（1977）提出的构造模型，
Nowlan and Thurlow have recently reported a conodont fauna of latest Arenig early Llanvirn age from the Buchans Group, central Newfoundland, and have suggested that this demonstrates that all volcanogenic massive sulfide deposits and, hence, associated volcanism in the Canadian Appalachians are of Caradocian or older Ordovician age. They go on to state that this requires substantial revisions of tectonic models for the northern Appalachians. We welcome this important contribution to the knowledge regarding the age of Roberts Arm Volcanic Belt (which includes the Buchans Group; Dean 1977) but find their suggestion that current tectonic models for central Newfoundland are inadequate or erroneous to be somewhat misleading. Perhaps this is the case if the "tectonic" models they are referring to are those, for instance, of Dean (1977, 1978), Strong (1977), or Dean and Kean (1980). However, their results strongly support the tectonic models set out by Kidd et al. (1977),